What Brian Williams remembers about that day, 26 years ago, is all of it, but mostly, where he was and who he was with when he heard the news: With 18th overall pick, in the first round of the 1989 NFL Draft, he was selected by the Giants.

“Probably my biggest, fondest memory from draft night is being with my family in our basement back home in Pittsburgh,’’ Williams told The Post. “Having my father there, my mother there, my brothers and sisters. It was just almost like the ‘Twilight Zone’ when the commissioner stood up there and announced my name and I was going to New York. It just didn’t seem real at the time. That memory I’ll never, ever, ever forget. It was very special. Obviously with coach [Bill] Parcells and George Young, obviously Wellington Mara, it was just unforgettable.’’

All these years later, after a nine-season career with the Giants as a sturdy center and leader of the offensive line, Williams is once again aboard the NFL draft thrill-ride. His son, Maxx, is rated as the top tight end and will likely hear his name called in the second round. Maxx Williams was invited to attend the draft in Chicago and said thanks, but no thanks.

“We’re gonna be at home in Minnesota,’’ Brian Williams said. “He wanted to be here with mom and dad and his grandparents and his family. That means a lot.

“To experience that again, no matter where or when he goes, it’s just having the opportunity to be there and having my son experience it. It’s almost unbelievable that it’s happening again, and we’re very fortunate to experience it.’’

Brian Williams runs a drill at Giants practice in 1997.New York Post

It is happening again for Brian Williams, who is now 48 and says he’s retired, other than some high school coaching and watching his kids excel on the field or the ice. His daughter, Danielle, played Division I hockey at Bemidji State and Maxx followed Brian and Rochele Williams — Rochelle was a star volleyball player — to the University of Minnesota. The athletic gene runs strong in Maxx. In addition to his athletic parents, his grandfather, Robert, was a quarterback at Notre Dame and was drafted by the Bears.

Maxx Williams is pretty much the consensus best player of what is a weak tight-end class. He’s got quite an upside; he recently turned 21 and has plenty of room for physical growth. Entering the draft as a redshirt sophomore, Williams played only two years for the Gophers. In 2014, operating in a run-first offense, he led the team with 36 receptions along with school single-season records for tight ends in receiving yards (569) and touchdowns (eight) to earn first-team All-Big Ten honors.

At 6-foot-4 and 249 pounds, Williams is athletic, can run, has big, soft hands and can hurdle defenders to gain chunks of yards after the catch. He’s a willing blocker who needs work at the point of attack but is expected to make his name at the next level as a pass-catcher. He’s got some Jason Witten in him as a receiving threat. Some scouts see him as a Jeremy Shockey-type.

“I think any team that picks him up is just gonna be thrilled to have him,’’ Brian Williams said. “One day he can turn into one of the great, very good tight ends in the league.’’

Brian Williams says he “would hope and pray’’ that Maxx gets drafted by a team with “a great quarterback’’ and mentioned the Ravens, Broncos and Saints as possibilities. There might be interest from the Browns. If you ask him to dream, he obliges.

“I think Green Bay would just be unreal, it really would,’’ he said, noting the geographic advantages of driving from Minnesota.

What about the Giants?

“That would be unheard of and a dream would come true like that,’’ Williams said, but he knows it’s not likely to happen.

The Giants re-signed Larry Donnell and Daniel Fells and are not expected to make tight end a priority in this year’s draft.

For the draft the Williams family will gather at their home in Waconia, Minn., to see where Maxx is headed. Brian knows he will go out and buy merchandize from whatever team takes his son, even though, alluding to his time with the Giants, says “I’m always gonna be old blue in the heart, so that will never change.’’

As far as looking forward to the draft, he added, “Everything kind of goes in big circles in the NFL. We’re pretty fortunate to be experiencing it again.’’